KR20060095575A - Fungicidal mixtures for controlling rice pathogens - Google Patents

Abstract

Disclosed are fungicidal mixtures for controlling rice pathogens, containing 1) a triazolopyrimidine derivative of formula (I), and 2) fenpiclonil of formula (II) at a synergistically effective quantity as active components. Also disclosed are methods for controlling rice pathogens by using mixtures of compound (I) and compound (II), the use of compound (I) along with compound (II) for producing such mixtures, and agents containing said mixtures.

Description

Fungicidal mixture for rice pathogen control {FUNGICIDAL MIXTURES FOR CONTROLLING RICE PATHOGENS}

The present invention relates to a fungicidal mixture for controlling rice pathogens, which is an active ingredient,

1) Triazolopyrimidine Derivatives of Formula (I)

And

2) fenpiclonyl of formula (II)

In a synergistically effective amount.

Moreover, the present invention relates to a method for controlling rice pathogens using a mixture of compound I and compound II and the use of compound I and compound II for the preparation of the mixture and compositions comprising the mixture.

5-Chloro-7- (4-methylpiperidin-1-yl) -6- (2,4,6-trifluorophenyl) [1,2,4] triazolo [1,5- as compound I a] pyrimidine, its preparation and its action against harmful fungi are known from WO 98/46607.

4- (2,3-dichlorophenyl) -1H-pyrrole-3-carbonitrile, compound II, its preparation and its action against harmful fungi are also described in Proc. 1998 Br. Crop Prot. Conf.- Pests Dis., Vol. 1, p. 65; Common name: fenpiclonyl.

Mixtures of triazolopyrimidine derivatives and fenpiclonyl are known in a general manner in EP-A 988 790. Compound I is included in the general disclosure of this publication, but is not explicitly mentioned. Thus, the combination of compound I and fenpiclonyl is novel.

Synergistic mixtures known from EP-A 988 790 have been described as having fungicidal activity against various diseases of cereals, fruits and vegetables, for example, white and wheat molds of wheat and barley or gray mold of apples.

Because of the special cultivation conditions of rice plants, the requirements that rice fungicides must meet are quite different from the requirements that fungicides used in grain or fruit growth must meet. There is a difference in application methods. In modern rice cultivation, in addition to foliar application, which is commonly used in many places, fungicides are applied directly onto the soil during or immediately after sowing. Fungicides are absorbed by the plant through the roots and transported to the plant parts that must be protected from the sap of the plant. In contrast, in grain or fruit growth, fungicides are usually applied to leaves or berries, so the systemic action of the active compounds in these crops is not of great importance.

Moreover, rice pathogens are largely different from grain or fruit pathogens. Pyricularia oryzae ), Cochliobolus miyabeanus and Corticium Sasaki sasakii ) (synonymous with Rhizoctonia solani ) is the most important pathogen of rice plants. Lizatonia Solani is the only pathogen of agricultural importance in the subfamily Agaricomycetidae . Unlike most other fungi, these fungi attack plants through mycelial infection, not through spores.

For this reason, findings about fungicidal activity in grain or fruit cultivation cannot be applied to rice crops.

Practical farming experiences have shown that in the case of many repeated and exclusive applications of individual active compounds in controlling harmful fungi, it leads to a rapid selection of fungal strains that develop natural or adapted resistance to the active compound in question. At this time, the effective control of this fungus by the active compound in question is no longer possible.

To reduce the risk of selecting resistant fungal strains, nowadays mixtures with other active compounds are commonly used to control harmful fungi. By using active compounds with different mechanisms of action, it is possible to ensure successful control over a relatively long time.

It is an object of the present invention to provide a mixture with an improved effect against harmful fungi, with a reduced overall amount of active compound applied, in view of effective resistance management and effective control of rice pathogens at the lowest possible dose.

It has been found that this object can be achieved by the mixture initially defined. Furthermore, it has been found that simultaneous application of compound I and compound II, ie jointly or separately, or successive application of compound I and compound II enables better control of rice pathogens than is possible with individual active compounds.

A mixture of compounds Ⅰ and compounds Ⅱ, or simultaneously, that is jointly or a compound Ⅰ and compound Ⅱ is ascorbyl my three tests (Ascomycetes), dew interrogating my three tests (Deuteromycetes) and a bar CD Oh, my three tests (Basidiomycetes) Steels rice used separately Excellent action against pathogens. They can be used for the treatment of seeds and can be used as foliar or soil-acting fungicides.

They are particularly important for the control of harmful fungi of rice plants and their seeds, for example Bipolaris and Drechslera species, and further on Pycuriculum duck. They are particularly suited to the control of brown pattern of rice caused by Coccliobolus miyabianus.

In addition, the combinations of compounds I and II according to the invention can be applied to other pathogens, for example, Septoria and Puccinia species of cereals and Alternaria of vegetables, fruits and grapevines, and It can also be used for the control of Botritis species.

In preparing the mixtures, it is preferred to use purely active compounds I and II, further active compounds against other harmful fungi or other pests, for example insects, arachnids or nematodes, or other herbicides or growth-regulating active compounds or Fertilizer may be added.

Other active compounds suitable for this concept are in particular fungicides selected from the following groups.

• Acylalanine, such as benalacyl, opureic or oxadixyl.

Amine derivatives such as aldimorph, dodemorph, fenpropidine, guaztine, iminottadine, tridemorph.

Anilinopyrimidines such as pyrimethanyl, mepanipyrim or ciprodinyl.

• antibiotics such as cycloheximide, griseofulvin, kasugamycin, natamycin, polyoxine or streptomycin.

Vitertanol, bromoconazole, ciproconazole, diphenoconazole, dinitroconazole, enylconazole, fenbuconazole, fluquinonezol, flusilazole, flutriafol, hexaconazole, imazaryl, Ipconazole, myclobutanyl, fenconazole, propiconazole, prochloraz, prothioconazole, simeconazole, tetraconazole, triadimefon, triadimenol, triflumisol, triticazole and Like azole.

Dicarboxymids such as microclozoline, procmidone.

Dithiocarbamates such as ferbam, nabam, metham, propineb, polycarbamate, jiram, geneb.

Anilazine, boscalid, oxycarboxycin, cyazopamide, dazomet, sofasadon, phenamidone, fuberidazole, flutolanil, furamepyr, isoprothiolane, mepronyl, noarimol, pro Heterocyclic compounds such as benzazole, pyroquilon, silthiofam, thibendazole, tifluzamide, thiadinil, tricyclazole, tripolin.

Nitrophenyl derivatives such as vinapacryl, dinocap, dinobutone or nitrophthalisopropyl.

Acibenzola-S-methyl, carpropamide, chlorothalonil, cyflufenamide, simoxanyl, diclomezine, diclosimet, dietofencarb, edifene, etaboxam, pentin-acetate And other fungicides such as phenoxanyl, perimzone, pocetyl, hexachlorobenzene, metraphenone, peniccuron, propamocarb, phthalide, toloclofos-methyl, quintogen, and oxamide.

• Strobillins, such as fluoxastrobin, metominostrobin, orissastrobin, or pyraclostrobin.

Sulfenic acid derivatives such as captapol.

Cinnamid and homologue compounds such as flumetober.

In one embodiment of the mixtures of the present invention, one additional fungicide III or two fungicides III and IV are added to compounds I and II. It is preferred to obtain a mixture of compounds I and II with component III added. It is particularly preferable to obtain mixtures of compounds I and II.

Compounds I and II can be applied simultaneously, ie jointly or separately, or in succession, and in the case of separate applications the order generally does not have any effect on the control treatment results.

Compounds I and II are usually applied in a weight ratio of 100: 1 to 1: 100, preferably 20: 1 to 1:20, especially 2: 1 to 1:10.

Components III and IV (if appropriate) are added to compound I in ratios of 20: 1 to 1:20, if necessary.

Depending on the type of compound and the desired effect, the dosage of the mixtures of the invention is between 5 g / ha and 2000 g / ha, preferably between 50 and 1500 g / ha, in particular between 50 and 900 g / ha.

Correspondingly, the dosage of compound I is generally from 1 g / ha to 1000 g / ha, preferably from 10 to 900 g / ha, in particular from 20 to 750 g / ha.

Correspondingly, the dosage of compound II is generally from 1 g / ha to 1500 g / h, preferably from 10 to 1000 g / ha, in particular from 20 to 900 g / ha.

In seed treatment, the dosage of the mixture is generally from 1 to 1000 g, preferably from 1 to 750 g and in particular from 5 to 500 g per 100 kg of seed.

In controlling fungal pathogens detrimental to rice plants, separate or co-application of compounds I and II or separate or co-application of mixtures of compound I and compound II may be carried out before or after seeding of seed, seedlings, plants or plants or of plants. By spraying or spraying soil before or after emergence. Compounds I and II are preferably applied by spraying the leaves in cavities or separately. Application can also be effected by application to a grain or by spraying onto soil.

The mixtures or compounds I and II of the present invention can be converted into conventional preparations, for example solutions, emulsions, suspensions, powders, powders, pastes and granules. The application form depends on the specific purpose, in each case to ensure a fine and uniform distribution of the compounds of the invention.

The formulations are prepared by extending the active compound with a solvent and / or carrier, using known methods, for example emulsifiers and dispersants, if necessary. Suitable solvents / adjuvant are the following.

Water, aromatic solvents (eg from Solvesso, xylene), paraffins (eg from petroleum fractions), alcohols (eg from methanol, butanol, pentanol, benzyl alcohol), ketones (eg from Cyclohexanone, gamma-butyrolactone), pyrrolidone (NMP, NOP), acetates (glycol diacetate), glycols, fatty acid dimethylamides, fatty acids and fatty acid esters. In principle, solvent mixtures may also be used.

Carriers such as ground natural minerals (eg kaolin, mud, talc, chalk) and ground synthetic minerals (eg highly dispersed silica, silicates); Emulsifiers such as nonionic and anionic emulsifiers (eg polyoxyethylene fatty alcohol ethers, alkylsulfonates and arylsulfonates) and dispersants such as lignosulfite waste liquors and methylcellulose.

Suitable surfactants are lignosulfonic acid, naphthalenesulfonic acid, phenolsulfonic acid, dibutylnaphthalenesulfonic acid, alkylarylsulfonates, alkyl sulfates, alkylsulfonates, fatty alcohol sulfates, alkali metals of fatty acids and sulfated fatty alcohol glycol ethers, alkalis Earth metal and ammonium salts, further condensates of sulfonated naphthalene and naphthalene derivatives with formaldehyde, condensates of naphthalene or naphthalenesulfonic acid with phenols and formaldehyde, polyoxyethylene octylphenyl ethers, ethoxylated isoctylphenols, octylphenols, nonyls Phenol, alkylphenyl polyglycol ether, tributylphenyl polyglycol ether, tristearylphenyl polyglycol ether, alkylaryl polyether alcohols, alcohol and fatty alcohol / ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers, Ethoxylated Polyoxypropylene, Lau Alcohol polyglycol ether acetal, sorbitol esters, a league nosul sulfite waste liquid, and methylcellulose.

Suitable materials for the preparation of direct sprayable solutions, emulsions, pastes or oil dispersions are medium to high boiling petroleum fractions such as kerosene or diesel oils, in addition to coal tar oils and oils of vegetable or animal origin, aliphatic, Cyclic and aromatic hydrocarbons (e.g. toluene, xylene, paraffin, tetrahydronaphthalene, alkylated naphthalene or derivatives thereof, methanol, ethanol, propanol, butanol, cyclohexanol, cyclohexanone, isophorone), strong polar solvents ( Dimethyl sulfoxide, N-methylpyrrolidone and water).

Powders, which are materials for spreading and spreadable products, can be prepared by mixing or grinding together the active materials and solid carriers.

Granules (eg coated granules, impregnated granules and homogeneous granules) can be prepared by binding the active compound to a solid carrier. Examples of solid carriers are silica gel, silicate, talc, kaolin, atclay, limestone, lime, chalk, church clay, loess, mud, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide Earth minerals, ground synthetics, ammonium sulfate, ammonium phosphate, ammonium nitrate, fertilizers such as urea, and plant origin products such as grain flour, bark flour, wood flour and peanut shell flour, cellulose powder, and other solid carriers.

In general, the formulations comprise 0.01 to 95% by weight of active compound, preferably 0.1 to 90% by weight. The active compound is used in purity (according to NMR spectrum) of 90% to 100%, preferably 95% to 100%.

The following is an example of a formulation.

1. Products diluted with water

A) Water Soluble Concentrate (SL)

10 parts by weight of the active compound are dissolved in water or an aqueous solvent. Alternatively, wetting agents or other auxiliaries are added. The active compound dissolves upon dilution with water.

B) Dispersible Concentrates (DC)

20 parts by weight of the active compound are dissolved in cyclohexanone with addition of a dispersant, for example polyvinylpyrrolidone. Dilution with water gives a dispersion.

C) Emulsifiable Concentrates (EC)

15 parts by weight of the active compound are dissolved in xylene added with calcium dodecylbenzenesulfonate and castor oil ethoxylate (concentration of 5% each). Dilution with water gives an emulsion.

D) Emulsion (EW, EO)

40 parts by weight of the active compound are dissolved in xylene added with calcium dodecylbenzenesulfonate and castor oil ethoxylate (concentration of 5% each). This mixture is mixed with water using an emulsifier (Ultraturrax) to make a homogeneous emulsion. Dilution with water gives an emulsion.

E) Suspensions (SC, OD)

In a stirred ball mill, 20 parts by weight of the active compound are subdivided by addition of a dispersant, a wetting agent and water or an organic solvent to obtain a fine active compound suspension. Dilution with water gives a stable suspension of the active compound.

F) Water Dispersible Granules and Water Soluble Granules (WG, SG)

50 parts by weight of the active compound are finely divided by the addition of a dispersant and a wetting agent and water-dispersible granules or water-soluble granules are made using specialized tools (eg extrusion, spray tower, fluidized bed). Dilution with water gives a stable dispersion or solution of the active compound.

G) Water Dispersible Powder and Water Soluble Powder (WP, SP)

75 parts by weight of active compound are ground in a rotor-stator mill with the addition of dispersant, wetting agent and silica gel. Dilution with water gives a stable dispersion or solution of the active compound.

2. Products that are applied without dilution

H) Sprayable Powder (DP)

5 parts by weight of the active compound is finely mixed and homogeneously mixed with 95% finely divided kaolin. This gives a sprayable product.

I) granules (GR, FG, GG, MG)

0.5 parts by weight of the active compound is finely bound to 95.5% carrier. Commonly used methods are extrusion, spray-drying or fluidized beds. This gives granules that are applied without dilution.

J) ULV Solution (UL)

10 parts by weight of the active compound are dissolved in an organic solvent, for example xylene. This gives a product that is applied without dilution.

The active compounds, as such, in the form of their preparations or in the form of use prepared therefrom, for example in the form of directly sprayable solutions, powders, suspensions or dispersions, emulsions, oil dispersions, pastes, sprayable products, spreading materials, or granules, It can be used by spraying, subdividing, spraying, spreading or injecting. The form of use depends entirely on the intended purpose, and in each case is intended to ensure the finest possible distribution of the active compounds of the invention.

Aqueous use forms can be prepared by adding water to emulsion concentrates, pastes or wettable powders (sprayable powders, oil dispersions). In order to prepare emulsions, pastes or oil dispersions, the material dissolved or as such in the oil or solvent may be homogenized in water by wetting agents, tackifiers, dispersants or emulsifiers. Alternatively, it is possible to prepare concentrates consisting of the active substances, wetting agents, tackifiers, dispersants or emulsifiers and, if necessary, solvents or oils, which concentrates are suitable for dilution with water.

Active compound concentrations in ready-to-use formulations can vary within a relatively wide range. Generally, the range is 0.0001 to 10%, preferably 0.01 to 1%.

Active compounds can also be used successfully in ultra-low sparging (ULV) processes, where it is possible to apply formulations containing at least 95% by weight of active compound, or even to apply the active compound without adducts. .

Various types of oils, wetting agents, adjuvants, herbicides, fungicides, other pesticides, or fungicides can be added to the active compound just before use (tank mix), if necessary. This agent is usually mixed with the compositions of the present invention in a weight ratio of 1:10 to 10: 1.

Compounds I and II or mixtures or corresponding preparations, in the case of mixtures or separate applications, provide for a fungicidally effective amount of compounds I and II to maintain a plant, seed, soil, area, material or space that is to be free of harmful fungi or fungi. It is applied by treatment. Application can be carried out before or after infection of the harmful fungi.

The fungicidal action of the compounds and mixtures can be demonstrated by the following experiment.

The active compounds, separately or in combination, were prepared in mother liquor with 0.25% by weight active compound in acetone or DMSO. Emulsifiers uni Ferrol ^® EL (Uniperol ^® EL) (wetting agent having emulsifying and dispersing action based on ethoxylated alkylphenols) was 1% by weight is added to the solution, the solution was diluted with water to the desired concentration.

Examples of use-active, protective application against brownish pattern of rice caused by Cocciolobolus miyabianus

The leaves of the cultivar "Tai-Nong 67" pollen rice seed were sprayed to the outlet point with an aqueous suspension having the active compound concentrations described below. The next day, the plants were inoculated with an aqueous spore suspension of Cocliobolus miyabianus. The test plants were then placed in a chamber set to 22-24 ° C. and 95-99% relative atmospheric humidity for 6 days. The extent of infection development of the leaves was visually determined.

Evaluation was performed by determining the percentage of infected plants. This percentage was converted to efficacy.

Efficacy (E) is calculated as follows using the Abbot equation.

E = (1-α / β)

α corresponds to the percent fungicidal infection rate of treated plants.

β corresponds to the percent fungicidal infection rate of untreated (control) plants.

Efficacy 0 means that the infection level of the treated plant is the same as infection level of the untreated control plant and efficacy 100 means that the treated plant is not infected.

Mixture expected efficacy of the active compounds is determined using the Colby formula (R.S. Colby, Weeds 15, 20-22, 1967) and compared with the observed efficacy.

Colby Formula:

E = x + y-xy / 100

E is the expected efficacy expressed in% of untreated control when using a mixture of active compounds A and B at concentrations a and b

x is the efficacy expressed in% of untreated control when using active compound A at concentration a

y is the efficacy expressed as% of untreated control when using active compound B at concentration b

The comparative compounds used were compounds A and B, known as fenpiclonyl mixtures described in EP-A 988 790.

The test results showed that although the comparative compounds were more effective than Compound I, at comparable dosages as individual active compounds, the mixtures of the present invention were strongly synergistic than the fenpiclonyl mixtures known in EP-A 988 790. It is very effective.

Claims (10)

1) Triazolopyrimidine Derivatives of Formula (I) <Formula I>

And 2) fenpiclonyl of formula (II)

<Formula II>    A fungicidal mixture for controlling rice pathogens, comprising a synergistically effective amount.  The fungicide mixture of claim 1 comprising the compound of Formula I and the compound of Formula II in a weight ratio of 100: 1 to 1: 100. A fungicidal composition comprising a liquid or solid carrier and a mixture of claims 1 or 2. A method of controlling rice-pathogenic harmful fungi, comprising treating plants, soil or seeds which are to be protected from fungi, their habitat or fungal attack with an effective amount of compounds I and II as described in claim 1. 5. The process according to claim 4, wherein compounds I and II as described in claim 1 are applied simultaneously, ie jointly or separately, or continuously. The method of claim 4 wherein the mixture of claim 1 or 2 is applied in an amount of 5 g / ha to 2000 g / ha. The method according to any one of claims 4 to 6, wherein the harmful fungal coccliobolus miyabianus is controlled. The method according to claim 4 or 5, wherein the mixture of claims 1 or 2 is applied in an amount of 1 to 1000 g per 100 kg of seeds. Seed comprising the mixture of claims 1 or 2 in an amount of 1 to 1000 g per 100 kg. Use of compound I and compound II as described in claim 1 for the preparation of a composition suitable for controlling rice-pathogenic harmful fungi.